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Discussion Starter #1
I HAVE ALWAYS USED GOOD OLE CONVENTIONAL 80-90W IN MY TRANS/T-CASE, AND AXLES. Has anyone tried any synthetic gear oils? I'm considering Lucase products.
 

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Mobil1 75w90 full synthetic for me - at least until the next change - when I'll probably go with whatever comparable product Valvoline has.

The local Exxon-Mobil sales network was bought out and they're no longer carrying the Mobil1 products.
 

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Discussion Starter #3
Mobil1 75w90 full synthetic for me - at least until the next change - when I'll probably go with whatever comparable product Valvoline has.

The local Exxon-Mobil sales network was bought out and they're no longer carrying the Mobil1 products.
Did you notice any difference in the trans/t-case operation?
 

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On the Vitara - no - on my Swift - definitely, smoother, sweeter - like the proverbial hot knife through butter.
 

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i use penrite comp diff oil in my diffs and it has made a big difference there alot quieter and they feel like there smoother
 

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Discussion Starter #7
According to the info I found, the axles prefer a GL-5 Synthetic, as where the tranny+tcase use a GL-4 prefereably non synthetic.

So I'm going to order a few qts of conventional lucas for the trans+tcase, and a few qts of full synthetic for the axles. I'm going to try the semi synthetic in the engine.


I'll report the results.
 

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Here's the story behind the GL4/GL5 thing.

GL5 oils are EP (extreme pressure) rated for use with hypoid gears such as found in the differentials, the early GL5 oils used sulphur as an EP additive, and under the right combination of heat & pressure the sulphur would attack the softer bronze components in a transmission.

Later GL5 oils no longer use sulphur and will be marked something along the lines of "yellow metal friendly", referring to the color of the brass & copper - these oils are safe in a transmission or transfer case.

By all means use what ever oil you wish in your vehicle, but for those who cannot find a GL4 oil, you can use a GL5, provided it is yellow metal friendly.

As far as using synthetics in transmissions goes - Suzuki has no recommendations either way, at least none that I've seen, but intenret lore contains such comments as it's too slippery for the syncromesh to work - as far as I'm concerned - HOGWASH! I've been running full synthetic, GL5 Mobil1 75W90 in one of my transmissions for over 15 years - and that's the one I refer to above as shifting like a hot knife through butter. I'll never put a conventional oil back in there.
 

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Here's the story behind the GL4/GL5 thing.

GL5 oils are EP (extreme pressure) rated for use with hypoid gears such as found in the differentials, the early GL5 oils used sulphur as an EP additive, and under the right combination of heat & pressure the sulphur would attack the softer bronze components in a transmission.

Later GL5 oils no longer use sulphur and will be marked something along the lines of "yellow metal friendly", referring to the color of the brass & copper - these oils are safe in a transmission or transfer case.

By all means use what ever oil you wish in your vehicle, but for those who cannot find a GL4 oil, you can use a GL5, provided it is yellow metal friendly.

As far as using synthetics in transmissions goes - Suzuki has no recommendations either way, at least none that I've seen, but intenret lore contains such comments as it's too slippery for the syncromesh to work - as far as I'm concerned - HOGWASH! I've been running full synthetic, GL5 Mobil1 75W90 in one of my transmissions for over 15 years - and that's the one I refer to above as shifting like a hot knife through butter. I'll never put a conventional oil back in there.[/QUOTE
My manual calls for gl4 or 5 in T/c and trans. Isnt either just fine? Got me thinking I need to change fluid now!
 

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If your manual says either GL4 or GL5, then make your choice from what's available in your neck of the woods - but I'm going to guess that you're not driving a 99~05 GV (you're posting in the 99~05GV section), because that's not in my manual.
 

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If your manual says either GL4 or GL5, then make your choice from what's available in your neck of the woods - but I'm going to guess that you're not driving a 99~05 GV (you're posting in the 99~05GV section), because that's not in my manua

Im sorry I didnt know we were talking those years mine is an 88 and for mine its either gl4 or 5 in t/c and tranny.
 
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